Walnut Scion & Rootstock Improvement
Walnut Scion & Rootstock Improvement
Walnut Scion & Rootstock Improvement
University of California
Walnut Scion & Rootstock Improvement

Obj. 3: Economic Impact of Disease-Resistant Rootstocks

Quantify economic impact of disease-resistant rootstocks on U.S. walnut industry.

It is expected that use of clonal rootstocks with improved resistance to rootstock pathogens will increase the profitability of the walnut industry. These orchards are expected to be more productive and have a longer and more productive life. Also, clonal rootstocks with improved pathogen resistance may reduce dependence on soil fumigation.

Economic/social and environmental benefits:

  • Disease resistant rootstocks will reduce the need for costly fumigation.
  • Resistant rootstocks will benefit growers, nurseries, farm workers, the general public and the environment by providing a more sustainable and environmentally friendly approach to nut tree and timber production.
  • Development of genomic resources for walnut and their use in rootstock development will facilitate efficient germplasm use saving the industry tens of thousands of dollars in breeding and propagation costs annually.

Expected Outcomes:

  • Facilitating adoption of clonal walnut rootstocks in orchards and nurseries leading to increased industry profits.
  • Developing a decision tool for choosing whether or not to replace a diseased or dying tree and when to replace an entire block. The tool will compare the performance of alternative rootstocks taking cost into consideration.


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